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Thread: Help Identifying Stains - Rounds Grey/Black Dots on plaster

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    Help Identifying Stains - Rounds Grey/Black Dots on plaster

    I need some help in identifying some stains in my pool. It is a salt water pool with plaster/quartz surface.
    We had the pool resurfaced last season but all of a sudden we are seeing a number of round spots which are dark grey in color. I think they might be some kind of metal stain but how do i determine what exactly?
    Any help would be greatly appreciated!!!
    25000 gallon IG
    Plaster Light Blue
    1 HP Motor
    Hayward Crystal Clear 2 DE filter
    Diving Board
    Kreepy Crawler
    Houston Texas

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    In the Industry

    Join Date
    Jul 2011
    Location
    Myrtle Beach, SC aka Redneck Riveria
    Posts
    125

    Re: Help Identifying Stains - Rounds Grey/Black Dots on plas

    Pictures please.

    Could be black algae. Does it feel slimy? Can you "scratch" the surface and it feel less slimy?
    "When your pool is sick, call the doctor, I make house calls"
    One stop pool shop, I do everything but install them. 9+ years of experience.

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    Re: Help Identifying Stains - Rounds Grey/Black Dots on plas

    I'm almost sure it's not algae, it doesn't feel slimy and it doesn't budge when brushed.
    25000 gallon IG
    Plaster Light Blue
    1 HP Motor
    Hayward Crystal Clear 2 DE filter
    Diving Board
    Kreepy Crawler
    Houston Texas

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    susa's Avatar
    Join Date
    Oct 2010
    Location
    Deep South
    Posts
    578

    Re: Help Identifying Stains - Rounds Grey/Black Dots on plas

    >> seeing a number of round spots which are dark grey in color

    what size, pencil eraser, thumb, palm size ?

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    Re: Help Identifying Stains - Rounds Grey/Black Dots on plas

    Size: ranges from dime to quarter size
    25000 gallon IG
    Plaster Light Blue
    1 HP Motor
    Hayward Crystal Clear 2 DE filter
    Diving Board
    Kreepy Crawler
    Houston Texas

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